Baking oven



Oct. 6, 1942. w, MATHESQN 7 2,297,969

BAKING OVEN Filed Aug. 26, 1939 4 Sheets-Sheet 1 Oct. 6, 1942. w, MATHESON 2,297,969

BAKING OVEN Filed Aug. 26, 1959 4 Sheets-Sheet 2 111;: 1.1-; :2; sun-u-sIn-azLs-4 :4

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BAKING OVEN Filed Aug. 26, 1939 4 Sheets-Sheet 4 n l.:.:. 1 l a 1 1 w 7 w M Z 2 r w/ I l 1 I 0 l 8 u an a 5 r r I 1.1.! l w Patented Oct. 6, 1942 UNITED STATES PATENT OFFICE Canad Application August 26, 1939, Serial No. 292,092

' 3 Claims. (01. 126 -340) The invention relates to baking ovens and an object of the invention is to provide a device which will act to automatically project the oven trays forwardly from the oven, when the oven door is opened, such allowing of the ready and convenient inspection or treatment of the cooking material customarily carried by the trays and which will thereafter, in the closing movement of the door, return the trays and material carriedthereby to their original position within the oven.

A further object of the invention is to construct one form of the device as a complete unit which can'be easily and quickly installed and serves to carry and actuate the various oven trays in the manner above stated.

A. further object is to provide a slightly modified orm of the device which can be readily installed in the existing oven and which serves to actuate the trays while the same are slidably carried by the customary tray'guides supplied on the opposing sides of the existing oven.

A further object is to construct all parts in a simple and inexpensive manner and such that the only connection required to be made, in so far as the oven is concerned, is that to theoven door.

A further object of the invention is to construct the device so that the oven door can be easily and quickly disconnected therefrom to Fig. 8 is a side view of a portion of one of the ,5 forward end of one of the operating arms.

Fig. 11 is a vertical sectionalview through the front end of the forward section of the operating arm and showing the front end of the inner section in side elevation. 1 k Fig. 12 isan enlarged side view of the operating arm.

Fig. 13 is a plan view of the operating arm.

Fig. 14 is a side view of the inner or rear section of the operating arm. Fig. 15 is a plan view of the partsappearing in Fig. 14. i Fig. .16 is an enlarged vertical sectional view at Iii-16, Fig. 14. x

Fig. 17 is an inverted plan view of part of the 20 inner or rear section of the operating arm.

l9l8, Fig. 18.

Fig. 20 is an enlarged horizontal sectional view at 20-20, Fig. 19.

Fig. 21 is a vertical sectional view at 2|-2|, Fig. 20, and looking in the direction of the applied allow of 'the subsequent opening and closing of arrowthe door without actuating the trays.

With the above more important and other minor objects in view, which will become apparent as the description proceeds, the invention consists essentially in the arrangement angponstruction of parts hereinafter described, reference being had to the accompanying drawings .in which:

Fig. 1 is a front view of an oven equipped with my invention and showing the oven door in the open position.

Fig. 2 is ahorizontal sectional view at 2-2, Fig. 1.

Fig. 3 is a vertical sectionalview taken at 3-3, Fig. 1, and showing the parts in reduced scale and with the door in open position.

Fig. 4 is a view similar to Fig. 3 but with the parts shown as they appear when the door is in closed position.

Fig. 5 is an enlarged detailed horizontal sectional view at 55, Fig. 4.

Fig. 6 is an enlarged detailed sectional view at 6-6, Fig. 4.

Fig.7 is a side view of the slotted plate.

Fig. 22 is an enlarged detailed sideview of the upper end of the slotted bracket used.

Fig. 23 is a plan view of the runner.

Fig. 24 is a plan view of the heat deflector and idrip tray.

4 indicate corresponding parts in the several figures. I

Theoven l is of the customary rectangular form and is provided with the customary closure door 2 which is hinged at 3 to swing from the opened position shown inFigs. 1 and 3 to the closed position shownin Fig. 4. Ahandle 4 is supplied for manipulating the door.

Usually ovens are provided on their side walls with spaced horizontal permanent guides-t0 slidably receive and carry the various removable trays but in the arrangement shown in Figs. 1 to 4 no such guides are supplied on the oven, but are provided elsewhere, as will be apparent as the description proceeds.

. The side walls of the oven, at top and bottom, each have horizontal channel irons 5 and 6 secured thereto and extending from front to back, the upper flanges of the lower channel irons forming guides 6 for a tray carrier now described and generally indicated by the'rference character 1. v

The tray carrier presents similar opposing parallel side walls or vertical plates 8 and 9 each of which has its lower edge terminating in an inverted T to provide an inside flange l and an outside flange l0, theoutside flange slidably engaging the guides 6'. The inner faces of the plates are provided with suitably spaced horizontal ledges or guides H for slidably receiving and supporting v.the inserted trays I2. The plates are connected at the ,top by a pair of brace bars l3 and I3, and at the rear by crossed braces I4 and II. V

It will be observed that the upper edges of the plates 8 and 9 underlie-and are slightly spaced from the undersides of the flanges of the bars 5. This permits free movement of the tray 'carrier ;when passing from the fully contained position within the oven as shown in Fig. 4 to the forward or fully extended position as shown in Fig. 3 and also positively prevents any upset-' ting or tilting action of the carrier, under load, when it is in the forward position. I

The inside flanges l0 serve to support the customary heat deflector I 5 located directly over the lower oven heater IS. The upper oven heater is indicated at I! and both are of the conventional type whether gas or electric.

I provide means for automatically advancing the tray carrier from the rear tothe forward position when the door is opened andfor returning it to the original position when the door is closed. Further'I supply an arrangement which permits one to dispense with the automatic feature when desired, such'then allowing of the door being opened or closed at will without moving the tray carrier from its rear position.

The normally automatic means supplied for controlling the tray carrier movement by the door movement is now described and in this connection it will be understood that there are duplicate parts at each side of the tray carrier connecting it with the oven door. a

To the outer side of each side wall of thetray carrier and directly overlying the flange l0 thereof, I secure rearwardly and permanently an action plate l8 which has a forward horizontal slot l8 therein, such slot being directly opposite a similar, slightly wider horizontal slot l9 provided in the side wall of the carrier. A tie rod 20 passes across the carrier and the ends thereof protrude beyond the plates l8 and form at each end pivots 20' for .one end of a link 2|. The other end of the link is pivotally connected bya pin 22 to the long arm 23' of a bell crank 23and the short arm 23 of the bell crank is pivotally.

niounted on a pivot pin 24 carried by the spaced parallel angularly disposed forks 25 and 26 of the operating arm 21 shortly described in detail. The bell crank at the bend, is pivotally mounted on a pin 28 which is constrained to freely slide 'in the slots l8 and IS. The forks 25 and 2B are both slotted at 29 concentric to the pin 24 and the projecting ends of the pin 22 are slidably received in such slots 29.

to receive the head of a bracket 32 to which it is pivotally attached by a pin 32'. The base of the bracket is securely bolted to the oven door by bolts 33."','

The rear section 3| of the arm has an extension leaf or bar 34 slidably attached to the front end thereof, by pins 35 and 38 which are received in slots 35' and 36' formed in the arm. In the nonextended' position of the bar the pins are in the rear ends of the slots and the front end of the bar is directly opposite the front end of the section 3! of the arm. At this time the end slots 31 and 31' provided in the said arm section and bar are in registration and are adapted to receive a cross pin 38 carried by the front end of the arm section. This pin pivotally carries a latch 39 fitted with a finger grip39' and with a toothed dog 39*, the dog being concentric to the said pin and adapted to pass through a slot 40 (see Fig.

ll) formed in thearm section 38 and into mating slots 4| and 4|. supplied in the arm section 3| and thebar 34, it being understood that the latter slots are mating when the bar 34 is nonextended- ,According to this latter arrangement, when thedog of the latch is fully in the slots it serves to lock the front and rear sections of the operating arm together so that they directly transmit any movement of the door to the other moving parts with which they areconnected.

The front end of the bar 34 is supplied with a downwardly projecting catch 42 which opiates in a lengthwise extending slot 42 (see Figs. 14 and 17) provided in the underside of the front end of the arm section 30.

The operation of the device above described is as follows assuming that the oven door is closed andthe arm sections are locked together by the dog of the latch, at which time the various parts are in the positions shown in Fig. 4. As the door initially opens, the tray carrier advances at approximately the same speed as the rapidly, the pins 28 moving backwardly in the slots l8. .The joints at 22 are caused to be broken at the time the'front edge of the lowermost tray in the carrier (or the carrier itself) is about to foul or strikethe opening door and this immediately causes a retarded movement of the carrier for a period sufficient to positively avoid fouling and when the fouling hazard position is passed there is an accelerated movement of the carrier, the carrier reaching its fully advanced position when the door is fully open.

When the door is subsequently closed a reverse movement takes place in the parts above referred to and it will be seen that'the arrangement provided causes an initial quick backward movement of the tray carrier, this being necessary to avoid the oven door striking the tray carrier as it initially moves up from the horizontal position.

It will be particularly noticed that all the operating parts are connected to the tray carrier and not to the oven. This permits ready installation,

as the only connection is that of the .brackets to the oven door, in their pr per locations.

If it is desired to let the tray carrier remain in the oven when the door is opened, one has to raise the latches 39 to withdraw the dogs from the locking slots. Naturally this can only be done when the door is in an open or partially .open position. Assuming it is in the fully open position when .this is done, then the pins 38 which are at such time in the rear. ends of the slots 31 and 31' act in the closing movement of the door to cause the arms to move the tray carrier back into the oven. Subsequently when thedoor is opened the tray carrier remains in the oven as the released sections of the arms slide freely one within the other, and during such movement the stops 42 engage with the rear ends of the slots 42' and cause the bars 34'to extend in relation to the arm sections 3| as permitted by the pins 35 and 36 sliding in the slots 35' and 36. Later when one wishes the automatic tray feature, it is only necessary to .open the door and manually pull the tray carrier ahead to its forward position at which.tim e the dogs of the latches can be re-entered in'the slots of the arm sections and the arm sections so locked together for subsequent operations. j

As herein before intimated, most ovens onthe market, are supplied on their opposing sidewalls with spaced horizontal guides for carrying the various trays inserted in the oven and I will now proceed to describe a modification of my invention which can be used where such type of evens are to be equipped and in the description thereof willrefer to Figs. 18 to 28 of the drawings wherein such modified structure is shown. Further in the description of the modified structure I will utilize the same reference numbers as applied to corresponding parts appearing in the foregoing disclosure. I The oven I in the modified arrangement presents spaced opposing horizontally extending guides 43 and 43 on which the inserted oven trays are customarily carried. The device correspofiding to the tray carrier previously described is in this instance somewhat 'diflerently constructed and comprises the parts now described. Similar vertical anchor posts 44 and 44' for the trays are supplied, these being herein shown as of channel iron cross section and as having the flanges thereof provided with opposing inner and outer bayonet slots 45 which are adapted to receive and anchor the rear cross members of the trays resting on the several guides 43 and 43'. The posts ,are connected by crossed'reinforcing braces 46 and are positioned just to the inner sides of the guides 43 and 43'. The lowerend of each post has a horizontally extending runner 41 permanently secured thereto, the runner being of an inverted T shaped cross section-and having the outer part of the horizontal flange 41' thereof slidably resting on the lowermost side guide of the oven. The vertical flange 4'1 of the runner, in each instance, is aligned with the outer flange of the post and to the said flanges I permanently fasten at their inner sides a vertical plate 18. The said plate has a horizontal slot 18 therein which is slightlywider than the opposing slot l9 provided in the vertical flange of the runner. I

A tie rod 20 connects the vertical flanges of the runners and passes also through the plate I8 and forms at each end a pivot 20 for one end of a link 2 I. The link is associated, in the same manner as previously described, with a bell crank .23,

.comparatively short, and is not. formed of sec- I tions as before.

The forward end of the arm .is forked to span the bracket head .to which it is pivotally connected by the pin 32' and the saidbracket is supplied with a .slot (see Fig, ,22) and indicated at 48 and which receives the latter pin. The pin is normally retained in the slot by a latch or keeper 39 pivotally attached. to the arm at 49 and held normally in pin retaining position by the spring 50. The bracket is secured to the door near the door hinge and extends vangularly outwardly and upwardly when the door is in the open position.

It will beobservedthat the bracket, operating arm, link and bell crank are all contained in each instance, between the vertical 'planescontaining theside flanges of the post and that in the closed position of the door, the posts and, runner jare all in their rear positions as arealso the various trays and the brackets are positioned to the rear side of and clear of the front portion of the lowermost wire tray 5|. In order to accommodate the brackets, in the closed position of'thedoor, the front inner side portions of the runners are Thecustomary wire trays 5| have their rear ends caught in both the flanges .of the respective posts and their sides resting on the guides 43 and 43' of the oven on which latter theyslide when the posts are advanced. I

Ovens are usually supplied with'a combination roaster and broiler tray 52 and in this arrangement the corners of such tray are made as'shown in Fig. 27 where it will be observed that the metallic body 53 of the tray is fashioned to expose the wire frame 54 so that the latter frame can be caught at approximately the points Aand B in the bayonet slots of the posts and further such that there will be no metallic partbetween the side wires 55 and 58 of the said tray to interfere with the free movement of the brackets, operating arms, bell cranks and links, should the said. tray be placed ina lower position in the oven.

Ovens are also supplied with a combination heat deflector and 'drippings tray 51 and in the latter arrangement of the invention the said tray in the closed position of the oven door has its rear end 5l'v caught in the lowermostbayonet slots of the inner flanges or theposts only and the rear portions of the side wiresS'I thereof slio'ably engaging the flanges of the runners.

As the front end of the latter tray is projected considerably beyond the brackets when the door is opened, and must therefore clear the brackets as it is being projected, it is necessary to provide the front corners of the said .tray. with means which will support it from the front ends of the flanges of the runners, when it isbeingprojected and whichwillautomatically-clear the brackets during the movement. To thisend I have provided each forward. corner of the latter traywith a rotatable three toothed gear or wheel58 which lies.horizontally'underneath the tray corner and is adjustably clamped in any suitable manner to the said tray. One of these teeth rests on the flangeof the runner and in so doing supports the front corner of the tray from runner flange. In

the opening movement of the door the brackets partially out away as best shown at 4l 'in Fig],

their springs.

with the result that the gears pass the brackets while continuing to support the front corners of the tray. Accordingly at no time during the tray movement is it unsupported.

The upper ends of the posts are provided with striker plates 59 which underlie the uppermost oven guides 43 and 43 and insure that the carrier cannot tilt when in its" forward position.

. The design of the various parts is such that the trays are all simultaneously advanced to the position indicated in dot and dash lines in Fig.

18 when the door is opened, and are effectively supported at such time and such that in the closing movement of the door the trays are all simultaneously moved back fast enough at all times to keep them clear of the closing door.

If it is desired in the latter arrangement to have the door open withoutactuating the trays,.

one simply disconnects the brackets from the actuating arms. This is done by first partially opening the door and then holding it in that position with one hand while the other hand shoves the trays backwardly into the oven. When this is done the pins 32' arewithdrawn from the slots 48 as the pressure developed will force the latches 39 back against the pressure of Once the pins are released the trays are shoved fully into the oven and will remain there in the subsequent opening and closing movement of the door.

The foregoing description has been directed to my invention as used in connection with ovens. It will however beunderstood that the invention can with equal facility be applied in any other location, where it is desirable to have interior members advanced from a containing chamber, upon the opening of the closure door of the chamber. Further it will be observed that the arrangement which I provide can be used in connection with a closure member or door swinging in a horizontal direction. In such a case the operating arms, instead of being at the sides of the chamber or oven as shown herein, will be at the top and bottom of the chamber or oven and will be attached to the associated parts in the same manner as herein disclosed.

I might now mention that the angularly extending forks 25 and 26 can be rigidly associated with the rear ends of the rear sections 3l of the operating arms or pivotly secured thereto.

Where they are rigidly attached to the said sections and the door is being opened or closed without producing any movement of the tray carrier, there is an idle movement of the mechanism parts in the oven, due to the fact that the operating arms are at such time rotating around the pins 24.

When they. are pivotly attached to the rear sections of the arms this idle movement is done away with. In this latter arrangement the forks movement of the door in the same manner as' previously described.

However, upon the latch 39 being released, the idle movement hereinbefore referred to of the parts immediately associated with the forks25 and 26 is avoided for the reason that in the initial, 'partialopening movement of the door the tubular. front section 30 of the operating arms slide in relation to the interior parts 3| and 34, and at approximately the time the front ends of the extensions 6| have escaped from the rear ends of the tubular sections 30, the catches 42 have been engaged with the rear ends of the slots 42', with the result that in the immediate, subsequent further opening movement of the door, the bars 34 are shifted to withdraw the dogs 83 from the slots 64. The slots '35 and 36' allow for the movement of the bars 34 in relation to the sections 3| when the latter are actuated by the catches and such slots also accommodate the full opening movement of the door to horizontal position. A J

I Obvious then, in the early opening movement of the door, thedogs 63 are automatically cleared from the tubes 30 and released from the slots 64, and the forks are thereafter free to turn on the pivot pins 62 so that there is no idle move ment of the parts associated with the forks during the further opening movement of the door to fully open position.

What I claim as my invention is:

l. The combination with an oven and the closure door thereof, of a tray carrier insertible as a unit within the oven and slidabl'y carried by the sides of the oven, a pair of operating arms having their forward ends each pivotally attached to the door at selected locations and their rear ends extending into the oven to the outer sides of the tray carrier, and terminating in inclined upturned spaced forks, a pivoted bell crank operating between the forks of each arm and having the pivot point thereof slidable in a receiving slot provided in the adjacent side of the carrier, a pivot pin connecting one arm of each bell crank to the adjacent operating arm, a pin carried by 25 and 26'are permanently riveted together at number 60 and the-fork 26 is supplied with a front extension 6| which is attached by a pivot pin 62 to the rear end of the arm section 3|.

' The extension 6| is supplied with a locking finger or dog 63 adapted to be received in a mating slot 54 provided in the rear end of the bar 34. The dog is in the slot 64 in the non-extending position of the operating arm and so positively locks the other arm of each bell crank and slidable in slots provided in the arm forks, said slots being concentric to the former pins, and a link pivotally connected to each side of the carrier and pivotally connected, between the forks to the pin operating in the fork slots. I

2. The combination with an oven and the upswinging hinged door thereof, of a tray carrier insertible as a unit within the oven and slidably carried by the side walls of the oven, said carrier presenting opposing side walls spaced from the oven side walls and provided on their inner sides with tray supporting ledges, similar operating arms having their forward ends pivotally attached to the door and their rear ends entering the spaces between the side walls of the carrier and oven and terminating in inclining upturned spaced forks, horizontally slotted action plate permanently secured to the outer side of each side wall of the carrier, 9. pin mounted for forward and rear sliding movementin each horizontal slot, a bell crank pivotally mounted on each pin and having one end pivotally attached by a pivot pin to the forks of the adjacent arm and the other end provided with a cross pin slidabiy received in slots formed in the said arm forks, said latter slots being concentric to the former pin connecting thebeil crank to the forks, and a link having one end pivotally mounted on thecross pin and the other end pivo'tally connected to the adjacent action plate. v, 3. In combination with a container having a pivoted closure door, a carrier mounte'dctvithin i0 ment thereof the container for forward and backward movement and an actuating link mechanism pivotally attached, only, to the door'and to the carrier,

and embodying a knuckle joint adapted to be automatically broken by theinitial opening movement of the door and producing in its subsequent breaking movement under the influence of the I opening door an initial retarded movement of the carrierand-a subsequent accelerated move- GILBERT R. W; MATHESON. v 

